I hate being da bad news guy.

First, LEDs can be used for flowering and will grow some very potent buds.

Just not those leds.
We call them China panels.
Not sayin' it's impossible to flower with these, cannabis can take a joke.
I'm just saying that you will not be thrilled with the yield and a smoke alarm is mandatory.

You might want to browse my photo albums.
Click on my avatar, then find albums and click "more albums."
You will find some excellent led grown bud snaps, and I think I have a picture of the Chinapanel's guts in there.
Lemme go look. . .

Yup here they are.
Attachment 291058Attachment 291059

It's the second panel to fail in less than 6 months.
There is no current limit other than a resistor so they blow out whole strings at a time.

Posted it because I used to be an electrician.
How unsafe is it?
Extremely!
There's good reason that you don't see an Underwriter's Laboratory sticker.

I had two of them, they are crap, sorry.

Aloha,
Weeze